For all polynomial functions with odd order, the domain is all real numbers (meaning you can put any real number in the function) and the image is also all real numbers (meaning the function outputs every real number). Also, some power functions, such as x2,2, have the same property.
However, none of elementary analytic functions that I can remember possess such qualities. For example, the image of ex doesn't contain negative numbers and sinx is limited to values between −1 and 1. Likewise, the domain of lnx doesn't include negative values.
Then, what are some examples of non-polynomial (nor power) analytic functions whose domains and images both are the entirety of real numbers?